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A 6 months old female presented with fever, irritability, and poor feeding for two days. Parents also report poor sleep and high- pitch crying. She was born in the hospital, and her mother had a spontaneous vaginal delivery. Parents refused immunization with repeated family doctor counseling. On examination, the pulse is 116 beats per minute, blood pressure is 80/50 mm hg, and the temperature is 102 F. She looks toxic and drowsy. The neck is stiff on examination. Meningitis is suspected, and lumbar puncture is planned. CSF gram-stain analysis shows gram-negative coccobacilli. Which of the following could have prevented the condition?

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